Want to know how fast your boat will go? Hull
speed is generally calculated by the length of the hull. Longer hulls are
generally faster. Note that many HPBs exceed their hull speed in sprints, but as
it takes a lot of power to do so, in "cruising" mode they will
generally stay at or under hull speed.

Hull Speed for a
foot long hull is:

6.04 Knots 6.95 MPH 11.18 KPH

Equation: hull speed (knots) = 1.35 * square root (hull length (ft) )

Calculate arbitrary average speeds from time and distance.

Distance:

Miles
Kilos
Meters

Time:

Minutes:Seconds - example: 14:03

Speed:

Traveling 1 Miles in 60:0 equates to:

0.87 Knots 1 MPH 1.61 KPH

Most displacement HPBs seem to do a 100 Meter
sprint in the 30 second range.